Description

a cross-section from 1972

number of observations : 30

observation : regional

country : United States

Usage

Format

A dataframe containing :

airq

indicator of air quality (the lower the better)

vala

value added of companies (in thousands of dollars)

rain

amount of rain (in inches)

coas

is it a coastal area ?

dens

population density (per square mile)

medi

average income per head (in US dollars)

References

Verbeek, Marno (2004) A Guide to Modern Econometrics, John Wiley and Sons, chapter 4.

See Also

Index.Source, Index.Economics, Index.Econometrics, Index.Observations